The weight and types of most rails
can easily be identified by referring to the dimensional diagrams
in this catalog. For these and other sections, the tee rails sections
data table lists basic dimensions and identifies mill marks usually
rolled on rail web.

If a special section is not listed,
simply place a piece of paper against the rail end, and impress its
outline into the paper by pressing your fingers against the rail edges.
With this information, Crown Steel can determine the best rail to
meet your individual needs.